I was going to write this part in my original email but wanted to stick to the main concern about use cases. I do live 3-4 months a year in NYC and in my pre-war building, T-mobile has spotty coverage. If I travel to Connecticut, 90 minutes away, there are many spots en-route where I do not get a signal.
In contrast, I can travel ~20 minutes outside a major metropolitian area in the US (Seattle) and be without cell service.
Heck I often am without cell service when I'm hiking. Then again I'm using a provider (T-Mobile) which is known to only work in metro areas!